Extract PerformanceLogger from AnalysisDriver.

pkg/analyzer/lib/src/context/builder.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.context.context_builder;
 
 import 'dart:collection';
 import 'dart:core';
 
 import 'package:analyzer/context/context_root.dart';
 import 'package:analyzer/context/declared_variables.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/plugin/resolver_provider.dart';
 import 'package:analyzer/source/analysis_options_provider.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
 import 'package:analyzer/src/command_line/arguments.dart'
     show
         applyAnalysisOptionFlags,
         bazelAnalysisOptionsPath,
         flutterAnalysisOptionsPath;
 import 'package:analyzer/src/dart/analysis/driver.dart'
-    show AnalysisDriver, AnalysisDriverScheduler, PerformanceLog;
+    show AnalysisDriver, AnalysisDriverScheduler;
 import 'package:analyzer/src/dart/analysis/file_state.dart';
 import 'package:analyzer/src/dart/sdk/sdk.dart';
 import 'package:analyzer/src/generated/bazel.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/gn.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/workspace.dart';
 import 'package:analyzer/src/lint/registry.dart';
 import 'package:analyzer/src/summary/summary_sdk.dart';
 import 'package:analyzer/src/task/options.dart';
 import 'package:args/args.dart';
+import 'package:front_end/src/base/performace_logger.dart';
 import 'package:front_end/src/incremental/byte_store.dart';
 import 'package:package_config/packages.dart';
 import 'package:package_config/packages_file.dart';
 import 'package:package_config/src/packages_impl.dart';
 import 'package:path/src/context.dart';
 import 'package:yaml/yaml.dart';
 
 /**
  * A utility class used to build an analysis context for a given directory.
  *
@@ skipping 772 matching lines @@
       throw new ArgumentError('not absolute: $path');
     }
     path = context.normalize(path);
     Resource resource = provider.getResource(path);
     if (resource is File) {
       path = resource.parent.path;
     }
     return new _BasicWorkspace._(provider, path, builder);
   }
 }